The 58-year-old Oscar-winning actress, who has been winning many awards for the portrayal of the Queen of England, said the award should be shared with the majesty, reported BBC online.
"I did feel very much that the response to the play was as much a response to that person, that extraordinary woman, as it was to my performance. But I should be very proud," she said before receiving the award.
Other honours were presented to actor Kevin Spacey for his work at London's Old Vic theatre, and to David Walliams for his performance as Bottom in 'A Midsummer Night's Dream'.
